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Method for preparing integrated battery cell

A battery cell, integrated technology, applied in the field of preparation of integrated battery cells, can solve the problems of weakened battery discharge capacity, uneven coating thickness, uneven particle distribution, etc., to improve puncture resistance and improve mechanical properties. Performance, green effect of preparation process

Inactive Publication Date: 2019-05-03
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separator prepared by the above method often has uneven coating thickness, Al 2 o 3 Problems such as uneven particle distribution and powder falling, when this separator is applied to the battery system, problems such as large battery impedance and poor consistency often occur, which significantly weaken the discharge capacity of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The jelly substance of the mixture of polyvinylidene fluoride and N-methylpyrrolidone solvent is sprayed respectively on the pre-prepared battery positive electrode and negative electrode sheet to form a jelly bond layer, according to "Positive electrode sheet / Jelly bond layer / Separator / Jelly Adhesive Layer / Negative Electrode Sheet" to assemble the single cell in sequence.

[0017] Dry the single cell in a vacuum to form a dry single cell.

[0018] A jelly adhesive layer of a mixture of polyvinylidene fluoride and N-methylpyrrolidone solvent is sprayed between two layers of dry monomer electric cores, and then dried and bonded to form a multi-body electric core.

[0019] Both the current collector of the positive pole piece and the current collector of the negative pole piece of the single cell are porous current collectors containing penetrating holes.

[0020] The colloidal substance bonding layer of the positive pole piece, the negative pole piece, the mixture of p...

Embodiment 2

[0023] The jelly substance of N-methylpyrrolidone of polyvinylidene fluoride and polymethyl methacrylate blend is sprayed respectively on the pre-prepared battery positive electrode and negative electrode sheet to form a jelly bond layer, according to "positive electrode sheet / Glue bonding layer / diaphragm / gel bonding layer / negative electrode sheet" to assemble the single battery cell in sequence.

[0024] Dry the single cell in an air dryer to form a dry single cell.

[0025] Spraying polyvinylidene fluoride and polymethyl methacrylate blended N-methylpyrrolidone jelly substance between two layers of dry monomer electric cores, and drying and bonding to form multi-body electric cores.

[0026] Both the current collector of the positive pole piece and the current collector of the negative pole piece of the single cell are porous current collectors containing penetrating holes.

[0027] The positive pole piece, the negative pole piece and the colloidal substance of N-methylpyr...

Embodiment 3

[0030] The jelly substance of N-methylpyrrolidone of polyvinylidene fluoride-hexafluoropropylene copolymer is sprayed on the pre-prepared battery positive electrode and negative electrode sheet respectively to form a jelly bond layer, according to "Positive electrode sheet / Jelly sticky Assemble the single cell in the order of "junction layer / diaphragm / gel adhesive layer / negative electrode sheet".

[0031] Dry the single cell in a vacuum to form a dry single cell.

[0032] Spray the polyvinylidene fluoride-hexafluoropropylene copolymer N-methylpyrrolidone jelly substance between the three layers of dry monomer batteries, and dry and bond them into multi-body batteries.

[0033] Both the current collector of the positive pole piece and the current collector of the negative pole piece of the single cell are porous current collectors containing penetrating holes.

[0034] The positive pole piece, the negative pole piece and the N-methylpyrrolidone colloid of polyvinylidene fluori...

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PUM

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Abstract

The invention relates to a method for preparing an integrated battery cell. The method is characterized by comprising spraying colloidal substances onto the positive electrode piece and the negative electrode piece of a battery to form a colloidal bonding layer; assembling an individual cell in the order of positive electrode piece / colloidal bonding layer / diaphragm / colloidal bonding layer / negativeelectrode piece; drying the individual cell; spraying the colloidal substance sprayed between two or more layers of dry individual cells to form the colloidal bonding layer, and forming a multilayercell by drying and bonding. The method introduces a polar group onto the surface of the diaphragm to increase the polar electrolyte absorption and retention properties of the diaphragm. The binder improves the mechanical property of the diaphragm and the safety performance of the battery. The method has a green preparation process and a simple operation process, and is suitable for industrial applications.

Description

technical field [0001] The invention relates to a method for preparing an integrated battery cell, in particular to a method for modifying a battery cell that can be used for lithium batteries, lithium ion batteries, polymer batteries and supercapacitors, and belongs to the technical field of battery preparation. technical background [0002] Lithium-ion batteries have excellent properties such as high theoretical capacity, long cycle life, and no memory effect. Separator is one of the important components of Li-ion battery. The separator is mainly used to isolate the positive and negative electrodes of the battery and allow the lithium ions in the battery to pass through. The electrolyte of the lithium battery is an organic solvent, therefore, the diaphragm material needs to be resistant to the erosion of the organic solvent. Polyethylene and polypropylene films are widely used in lithium-ion battery systems due to their high porosity, low electrical resistance, good tear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/62H01M2/20H01G11/10H01G11/84H01M50/46H01M50/489H01M50/586
CPCY02E60/10Y02P70/50
Inventor 童庆松何雨悦高峰李秀华席强童君开
Owner FUJIAN NORMAL UNIV
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